Actions of Muscles Flashcards

1
Q

latissumus dorsi (3)

A

shoulder extension, adduction, IR

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2
Q

upper trapezius bi/uni (5)

A

bi:
head/neck– extension

uni:
head/neck–
lateral flexion
contralateral rotation

scapula–
elevate
upwardly rotate

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3
Q

middle trapezius (2)

A

scapula:
adduct/retract
stabilize

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4
Q

lower trapezius (2)

A

scapula:
depress
upwardly rotate

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5
Q

levator scapulae (2)

A

scapula:
elevate
downwardly rotate

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6
Q

rhomboids (3)

A

scapula:
adduct/retract
downwardly rotate
fix scapula to thoracic wall

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7
Q

splenius bi/uni (3)

A

bi:
head/neck—
extension
uni:
head/neck—
lateral flexion
ipsilateral rotation

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8
Q

erector spinae group bi/uni (2)

A

bi:
spine– extension
uni:
spine– ipsilateral flexion

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9
Q

rotatores bi/uni (2)

A

bi:
spine– extension
uni:
spine– contralateral rotation

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10
Q

multifidus bi/uni (3)

A

bi:
spine– extension
uni:
spine–
contralateral rotation
stabilize

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11
Q

semispinalis bi/uni (2)

A

head/neck/spine–
bi: extension
uni: contralateral rotation

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12
Q

rectus capitis posterior major and minor (2)

A

head–
extension
ipsilateral rotation

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13
Q

obliquus capitis superior bi/uni (2)

A

head–
bi:
extension
uni:
ipsilateral flexion

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14
Q

obliquus capitis inferior (1)

A

head– ipsilateral rotation

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15
Q

deltoid (clavicular) (2)

A

shoulder–
flexion
IR

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16
Q

deltoid (acromial)

A

shoulder– abduction

17
Q

deltoid (spinal) (2)

A

shoulder–
extension
ER

18
Q

pectoralis major (both heads) (3)

A

shoulder–
adduct
IR
horizontal adduction

19
Q

pectoralis major (clavicular) (1)

A

shoulder–
flexion

20
Q

pectoralis major (sterno) (1)

A

shoulder–
extension

21
Q

pectoralis minor (2)

A

scapula–
stabilizes scapula against thoracic wall
thorax–
elevates during inhalation

22
Q

teres major (3)

A

shoulder–
adduct
extension
IR

23
Q

supraspinatus (2)

A

shoulder–
abduction
stabilizes head of humerus

24
Q

infraspinatus (2)

A

shoulder–
ER
stabilizes head of humerus

25
Q

teres minor (2)

A

shoulder–
ER (helper)
stabilizes head of humerus

26
Q

subscapularis (2)

A

shoulder–
IR
stabilizes head of humerus

27
Q

serratus anterior (2)

A

scapula–
protract
stabilizes scapula against thoracic wall

28
Q

sternocleidomastoid bi/uni (4)

A

uni:
head/neck–
ipsilateral flexion
contralateral rotation

bi:
head/neck–
extension (at OA joint)
flexion (cervical)
extension of superior cervical AND flexion of inferior vertebrae

29
Q

platysma

A

frown
draws skin of neck superiorly

30
Q

external intercostals

A

draws ribs up with inhalation

31
Q

internal intercostals

A

draws ribs down with exhalation

32
Q

diaphragm

A

increases volume in thoracic cavity during inhalation

33
Q

quadratus lumborum (4)

A

bi: fix last rib during forced inhalation

uni:
pelvis–
laterally hike
spine–
ipsilateral flexion
ipsilateral extension

34
Q

psoas major (4)

A

trunk–
balance
flexion (acting inferiorly with iliacus)

hip–
flexion (acting inferiorly with iliacus)

spine–
lateral flexion (acting superiorly)

35
Q

iliacus (2)

A

hip–
flexion
stabilizes hip joint
*acts with psoas major

36
Q

rectus abdominis (3)

A

spine–
flexion

pelvis–
posterior tilting

abdominal viscera–
compression

37
Q

external oblique bi/uni (3)

A

spine–
bi:
flex
compress abdominal contents
uni:
lateral flexion
contralateral rotation

38
Q

internal oblique bi/uni (4)

A

spine–
bi:
flexion
compress abdominal contents
uni–
lateral flexion
ipsilateral rotation